Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 05 406.4 MM, OF IRON OR STEEL. 73 05 19 OTHER LINE PIPE OF A KIND USED FOR OIL/GAS PIPELINES Commodity Code Description 73 05 19 00 OTHER LINE PIPE OF A KIND USED FOR OIL/GAS PIPELINES